In reply to sheelba:
like many others on this thread, have climbed in the area and can recommend the aforementioned routes. We aimed to do the biancograt but the weather forecasts didn't play in our favour. The actual weather, it turns out, would have been fine. The guides in Pontresina were fantastically helpful, giving us info on conditions, rock routes to do on our rest days etc.
We climbed Piz Morterasch the first day. Lovely climb but the rock scramble from the Boval Hut had us second guessing the approach - until we found the red dots.
Then took the diovalezza up and camped on the glacier for 3 nights, climbing piz cambrena one morning - beautiful but a bit more technical climbing. And then the traverse of Piz Palu. A very comfortable and satisfying day out.
Definitely want to go back for the Biancorgrat as when you see it from Piz Morterasch, it is tempting beyond belief.
Also, stayed in the campsite in Morterasch. Very accommodating couple who run the place - let us come and go as we pleased and just paid for the days we stayed on an honesty basis. And you can talk to all the older couples who climbed the same routes a few years back, in their 70s and make you feel properly humble.
Enjoy